"""Shared fixtures for unit tests."""
import pytest
from unittest.mock import MagicMock


@pytest.fixture
def neo4j_driver():
    """A MagicMock Neo4j driver whose session yields no records by default."""
    driver = MagicMock()
    session = driver.session.return_value.__enter__.return_value
    session.run.return_value = iter([])
    return driver


@pytest.fixture
def snowflake_executor():
    """A MagicMock Snowflake executor whose fetchall returns [] by default."""
    executor = MagicMock()
    executor.fetchall.return_value = []
    return executor